I am a prime number.
The double of myself is equal to the square of me.

which number am I?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

There are 2 cops parked along a one-way street looking for traffic violations. They spot a taxi driver going in the wrong direction, yet they do nothing.

Why?

Only one colour, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Which word does the below Plexor means ?

If 1+9+8=1, what is 2+8+9?

What goes up but never comes down?

A man dies of old age on his 25 birthday. How is this possible?